The associated complaint devices were returned and evaluated.A visual inspection of the returned devices noted the devices are intact and resemble typical explanted devices.A review of complaint history revealed no prior complaints for the listed lots/failure mode.A review of the manufacturing records did not reveal any manufacturing or material abnormalities that could have caused or contributed to the reported incident.An evaluation performed by our research lab revealed the returned devices showed bone on-growth on the shell.It also noted burnishing on the shell, possibly due to the reported bone loss.Damage was noted on the articulating surface of the liner, which was likely caused during removal.No material or manufacturing deviations were observed during this investigation.Our investigation could not determine a specific cause of the failure.At this time, we have no reason to suspect that the product failed to meet any product specifications at the time of manufacture.This investigation could not verify or identify any evidence of product contribution to the reported problem.Based on this investigation, the need for corrective action is not indicated.
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